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Finding the Third Proportional to 279.94 and 478.78

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Solution

The third proportional to 279.94 and 478.78 is: 818.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.94 : 478.78 = 478.78 : x
  2. Step 2: Convert to fraction form
    279.94/478.78 = 478.78/x
  3. Step 3: Cross multiply
    279.94x = 478.78 × 478.78
  4. Step 4: Simplify right side
    279.94x = 229,231.49
  5. Step 5: Solve for x
    x = 229,231.49/279.94
  6. Step 6: Final answer
    x = 818.87

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Why These Related Problems?

These problems maintain the same ratio (1.71) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.